The
Internationally recognized official SI names for large and small
numbers are shown below. These are taken from the Bureau International des Poids
et Mesures (BIPM) website:
http://www.bipm.fr/en/si/prefixes.html
Prefix
Name
Numerical
representation
yotta
(Y)
1024
1 septillion
1,000,000,000,000,000,000,000,000
zetta
(Z)
1021
1 sextillion
1,000,000,000,000,000,000,000
exa
(E)
1018
1 quintillion
1,000,000,000,000,000,000
peta
(P)
1015
1 quadrillion
1,000,000,000,000,000
tera
(T)
1012
1 trillion
1,000,000,000,000
giga
(G)
109
1 billion
1,000,000,000
mega
(M)
106
1 million
1,000,000
kilo
(k)
103
1 thousand
1,000
hecto
(h)
102
1 hundred
100
deka
(da)
10
1 ten
10
1
one unit
1
deci
(d)
10-1
1 tenth
.1
centi
(c)
10-2
1 hundredth
.01
milli
(m)
10-3
1 thousandth
.001
micro
(µ)
10-6
1 millionth
.000001
nano
(n)
10-9
1 billionth
.000000001
pico
(p)
10-12
1 trillionth
.000000000001
femto
(f)
10-15
1 quadrillionth
.000000000000001
atto
(a)
10-18
1 quintillionth
.000000000000000001
zepto
(z)
10-21
1 sextillionth
.000000000000000000001
yocto
(y)
10-24
1 septillionth
.000000000000000000000001